Merge "Enable Quadgram for personalized dicts."

    // (MAX_PREV_WORD_COUNT_FOR_N_GRAM + 1)-gram is supported in Java side. Needs to modify

    // MAX_PREV_WORD_COUNT_FOR_N_GRAM in native/jni/src/defines.h for suggestions.

    public static final int MAX_PREV_WORD_COUNT_FOR_N_GRAM = 2;

    public static final int MAX_PREV_WORD_COUNT_FOR_N_GRAM = 3;

    // Key events coming any faster than this are long-presses.

    public static final int LONG_PRESS_MILLISECONDS = 200;

#define MAX_POINTER_COUNT_G 2

// (MAX_PREV_WORD_COUNT_FOR_N_GRAM + 1)-gram is supported.

#define MAX_PREV_WORD_COUNT_FOR_N_GRAM 2

#define MAX_PREV_WORD_COUNT_FOR_N_GRAM 3

#define DISALLOW_DEFAULT_CONSTRUCTOR(TypeName) \

  TypeName() = delete

const char *const HeaderPolicy::DATE_KEY = "date";

const char *const HeaderPolicy::LAST_DECAYED_TIME_KEY = "LAST_DECAYED_TIME";

const char *const HeaderPolicy::NGRAM_COUNT_KEYS[] =

        {"UNIGRAM_COUNT", "BIGRAM_COUNT", "TRIGRAM_COUNT"};

        {"UNIGRAM_COUNT", "BIGRAM_COUNT", "TRIGRAM_COUNT", "QUADGRAM_COUNT"};

const char *const HeaderPolicy::MAX_NGRAM_COUNT_KEYS[] =

        {"MAX_UNIGRAM_ENTRY_COUNT", "MAX_BIGRAM_ENTRY_COUNT", "MAX_TRIGRAM_ENTRY_COUNT"};

const int HeaderPolicy::DEFAULT_MAX_NGRAM_COUNTS[] = {10000, 30000, 30000};

        {"MAX_UNIGRAM_ENTRY_COUNT", "MAX_BIGRAM_ENTRY_COUNT", "MAX_TRIGRAM_ENTRY_COUNT",

                "MAX_QUADGRAM_ENTRY_COUNT"};

const int HeaderPolicy::DEFAULT_MAX_NGRAM_COUNTS[] = {10000, 30000, 30000, 30000};

const char *const HeaderPolicy::EXTENDED_REGION_SIZE_KEY = "EXTENDED_REGION_SIZE";

// Historical info is information that is needed to support decaying such as timestamp, level and

// count.

namespace latinime {

// Used to provide stable probabilities even if the user's input count is small.

const int DynamicLanguageModelProbabilityUtils::ASSUMED_MIN_COUNTS[] = {8192, 2, 2};

const int DynamicLanguageModelProbabilityUtils::ASSUMED_MIN_COUNTS[] = {8192, 2, 2, 1};

// Encoded backoff weights.

// Note that we give positive value for trigrams that means the weight is more than 1.

// Note that we give positive values for trigrams and quadgrams that means the weight is more than

// 1.

// TODO: Apply backoff for main dictionaries and quit giving a positive backoff weight.

const int DynamicLanguageModelProbabilityUtils::ENCODED_BACKOFF_WEIGHTS[] = {-32, 0, 8};

const int DynamicLanguageModelProbabilityUtils::ENCODED_BACKOFF_WEIGHTS[] = {-32, -4, 2, 8};

// This value is used to remove too old entries from the dictionary.

const int DynamicLanguageModelProbabilityUtils::DURATION_TO_DISCARD_ENTRY_IN_SECONDS =

private:

    DISALLOW_IMPLICIT_CONSTRUCTORS(DynamicLanguageModelProbabilityUtils);

    static_assert(MAX_PREV_WORD_COUNT_FOR_N_GRAM <= 2, "Max supported Ngram is Trigram.");

    static_assert(MAX_PREV_WORD_COUNT_FOR_N_GRAM <= 3, "Max supported Ngram is Quadgram.");

    static const int ASSUMED_MIN_COUNTS[];

    static const int ENCODED_BACKOFF_WEIGHTS[];